/* ============================================
   Personal Finance Tracker - Stylesheet
   ============================================ */

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Brand */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-50: #eef2ff;

    /* Semantic */
    --income: #10b981;
    --income-light: #d1fae5;
    --income-dark: #047857;
    --expense: #ef4444;
    --expense-light: #fee2e2;
    --expense-dark: #b91c1c;

    /* Neutrals */
    --bg: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --text: #0f172a;
    --text-muted: #64748b;
    --text-light: #94a3b8;

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 0% 0%, rgba(99, 102, 241, 0.08), transparent 50%),
        radial-gradient(circle at 100% 0%, rgba(168, 85, 247, 0.06), transparent 50%);
    background-attachment: fixed;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

button {
    background: none;
    border: none;
    cursor: pointer;
}

input,
select {
    outline: none;
}

svg {
    width: 1em;
    height: 1em;
    flex-shrink: 0;
}

/* ---------- Layout ---------- */
.app {
    max-width: 1280px;
    margin: 0 auto;
    padding: 32px 24px 48px;
}

/* ---------- Header ---------- */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    gap: 16px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    color: white;
    display: grid;
    place-items: center;
    font-size: 24px;
    box-shadow: 0 8px 16px -4px rgba(99, 102, 241, 0.4);
}

.brand h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

.brand-sub {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 2px;
}

.date-display {
    font-size: 14px;
    color: var(--text-muted);
    background: var(--surface);
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--border);
    font-weight: 500;
}

/* ---------- Summary Cards ---------- */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.summary-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--border);
    transition: background 0.2s;
}

.summary-card.balance::before { background: var(--primary); }
.summary-card.income::before { background: var(--income); }
.summary-card.expense::before { background: var(--expense); }
.summary-card.count::before { background: #f59e0b; }

.summary-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.summary-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-size: 20px;
    flex-shrink: 0;
}

.summary-card.balance .summary-icon { background: var(--primary-50); color: var(--primary); }
.summary-card.income .summary-icon { background: var(--income-light); color: var(--income-dark); }
.summary-card.expense .summary-icon { background: var(--expense-light); color: var(--expense-dark); }
.summary-card.count .summary-icon { background: #fef3c7; color: #b45309; }

.summary-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.summary-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 2px;
}

.summary-value {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.summary-card.income .summary-value { color: var(--income-dark); }
.summary-card.expense .summary-value { color: var(--expense-dark); }

/* ---------- Main Grid ---------- */
.main-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 24px;
    margin-bottom: 24px;
}

/* ---------- Card ---------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.card-header {
    margin-bottom: 20px;
}

.card-header h2 {
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.card-header p {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* ---------- Form ---------- */
.transaction-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.type-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    background: var(--bg);
    padding: 4px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.type-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.15s ease;
}

.type-btn svg {
    font-size: 14px;
}

.type-btn:hover {
    color: var(--text);
}

.type-btn.active[data-type="expense"] {
    background: var(--expense);
    color: white;
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

.type-btn.active[data-type="income"] {
    background: var(--income);
    color: white;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 11px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--surface);
    transition: border-color 0.15s, box-shadow 0.15s;
    color: var(--text);
}

.form-group input::placeholder {
    color: var(--text-light);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.form-group input:hover,
.form-group select:hover {
    border-color: var(--border-strong);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.input-prefix {
    position: relative;
}

.input-prefix span {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-weight: 500;
    pointer-events: none;
}

.input-prefix input {
    padding-left: 28px !important;
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3e%3cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3e%3c/svg%3e") !important;
    background-repeat: no-repeat !important;
    background-position: right 14px center !important;
    padding-right: 36px !important;
    cursor: pointer;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    transition: all 0.15s ease;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.3);
    margin-top: 4px;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 12px -2px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary svg {
    font-size: 16px;
}

/* ---------- Chart ---------- */
.chart-container {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    height: 220px;
    padding: 16px 0 8px;
    overflow-x: auto;
}

.chart-bar-group {
    flex: 1;
    min-width: 50px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    height: 100%;
}

.chart-bars {
    display: flex;
    gap: 4px;
    align-items: flex-end;
    flex: 1;
    width: 100%;
    justify-content: center;
    padding-bottom: 4px;
}

.chart-bar {
    width: 14px;
    border-radius: 4px 4px 0 0;
    min-height: 2px;
    transition: opacity 0.2s;
    position: relative;
}

.chart-bar:hover {
    opacity: 0.8;
}

.chart-bar.income {
    background: linear-gradient(180deg, var(--income) 0%, var(--income-dark) 100%);
}

.chart-bar.expense {
    background: linear-gradient(180deg, var(--expense) 0%, var(--expense-dark) 100%);
}

.chart-label {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
}

.chart-legend {
    display: flex;
    gap: 20px;
    justify-content: center;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    margin-top: 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 3px;
}

.income-dot { background: var(--income); }
.expense-dot { background: var(--expense); }

/* ---------- Transactions List ---------- */
.list-card {
    padding: 0;
    overflow: hidden;
}

.list-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 24px 24px 16px;
    margin-bottom: 0;
    flex-wrap: wrap;
    gap: 16px;
}

.filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box svg {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
    font-size: 14px;
    pointer-events: none;
}

.search-box input {
    padding: 9px 12px 9px 34px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    width: 180px;
    background: var(--surface);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.filter-select {
    padding: 9px 32px 9px 12px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background: var(--surface);
    cursor: pointer;
    transition: border-color 0.15s;
}

.filter-select:hover {
    border-color: var(--border-strong);
}

.filter-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.transactions-list {
    max-height: 500px;
    overflow-y: auto;
}

.transactions-list::-webkit-scrollbar {
    width: 8px;
}

.transactions-list::-webkit-scrollbar-track {
    background: var(--bg);
}

.transactions-list::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 4px;
}

.transactions-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}

.transaction-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 24px;
    border-top: 1px solid var(--border);
    transition: background 0.15s;
    animation: slideIn 0.25s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.transaction-item:hover {
    background: var(--bg);
}

.transaction-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    font-size: 20px;
    flex-shrink: 0;
}

.transaction-item.income .transaction-icon {
    background: var(--income-light);
}

.transaction-item.expense .transaction-icon {
    background: var(--expense-light);
}

.transaction-details {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.transaction-description {
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.transaction-meta {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    gap: 8px;
    align-items: center;
}

.transaction-meta .dot {
    width: 3px;
    height: 3px;
    background: var(--text-light);
    border-radius: 50%;
}

.transaction-amount {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    white-space: nowrap;
}

.transaction-item.income .transaction-amount {
    color: var(--income-dark);
}

.transaction-item.expense .transaction-amount {
    color: var(--expense-dark);
}

.transaction-delete {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    color: var(--text-light);
    display: grid;
    place-items: center;
    transition: all 0.15s;
    opacity: 0;
}

.transaction-item:hover .transaction-delete {
    opacity: 1;
}

.transaction-delete:hover {
    background: var(--expense-light);
    color: var(--expense-dark);
}

.transaction-delete svg {
    font-size: 16px;
}

/* ---------- Empty State ---------- */
.empty-state {
    text-align: center;
    padding: 60px 24px;
    display: none;
}

.empty-state.show {
    display: block;
}

.empty-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: var(--bg);
    border-radius: 16px;
    display: grid;
    place-items: center;
    color: var(--text-light);
    font-size: 28px;
}

.empty-state h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.empty-state p {
    font-size: 14px;
    color: var(--text-muted);
    max-width: 320px;
    margin: 0 auto;
}

/* ---------- Footer ---------- */
.app-footer {
    margin-top: 32px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

/* ---------- Toast ---------- */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(120%);
    background: var(--text);
    color: white;
    padding: 12px 20px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast svg {
    color: var(--income);
    font-size: 16px;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .app {
        padding: 20px 16px 32px;
    }

    .brand h1 {
        font-size: 20px;
    }

    .brand-sub {
        font-size: 12px;
    }

    .brand-icon {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    .summary-value {
        font-size: 18px;
    }

    .summary-icon {
        width: 38px;
        height: 38px;
        font-size: 17px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .list-header {
        flex-direction: column;
        align-items: stretch;
    }

    .filters {
        width: 100%;
    }

    .search-box input {
        flex: 1;
        width: auto;
    }

    .transaction-item {
        padding: 12px 16px;
    }

    .transaction-delete {
        opacity: 1;
    }

    .chart-container {
        height: 180px;
    }
}